South Carolina's 4% Legal Residence Ratio: How to Qualify, Apply and Keep It

What the 4% ratio changes on a tax bill

SCDOR describes every property tax bill as value times assessment ratio times millage, and the ratio is the part you control. Under S.C. Code 12-43-220(c), your legal residence and up to five contiguous acres are assessed at 4% of fair market value. Under 12-43-220(e), other real property, including second homes and long- and short-term rentals, is assessed at 6%.

A home receiving 4% is also exempt from property taxes imposed for school operating purposes under 12-37-220(B)(47). Millage for school bonds, the county and the city still applies, and SCDOR notes the exemption follows only an approved 4% classification.

Who qualifies

• You own the home in whole or in part, in fee or by life estate, occupy it, and it is your domicile.
• You owned, occupied and were domiciled there for some period during the tax year. Qualifying for part of a year gives 4% for the whole year.
• Neither you nor a member of your household (your spouse, subject to a narrow separation exception, and dependent children under 18) claims legal residence in another jurisdiction for any purpose, or claims 4% on another home.
• The home is not rented for more than 72 days in a calendar year. Renting part of the home to another person as a residence while you live there does not cost you 4%; a separately rented unit or business on the parcel is taxed at 6%.
• Additional dwellings on the property occupied by immediate family can share the 4% ratio, as can a home held in trust for an income beneficiary who lives there or, per SCDOR, owned by a single-member LLC not taxed as a corporation.

How and when to apply

The application goes to the county assessor, not to SCDOR and not on your income tax return. Section 12-43-220(c)(2)(ii) requires it before the first penalty date for the first tax year you claim. Under 12-45-180 that penalty applies to taxes not paid before January 16, or 30 days after bills are mailed if later, so the practical deadline is usually January 15 after the tax year. Filing late abandons the classification for that year unless the local taxing authority accepts reasonable cause. Once approved, you do not reapply while the home stays eligible.

You certify under penalty of perjury and carry the burden of proof. The statute lets the assessor require your latest South Carolina income tax return, South Carolina registrations for your vehicles at that address, and parts of your federal and state returns including Schedule E. Charleston County's form (revised April 14, 2026) also asks every owner-occupant and spouse for a South Carolina driver's license and voter registration, the first pages of the 1040 with Schedules 1, C and E and Form 8829 where they apply, and returns from every state filed. A spouse must sign even if not on the deed, and the county takes mailed or hand-delivered originals or its online application, not fax or email.

If your application is not approved when the bill is due, Charleston County says to pay the bill as issued; a refund follows if 4% is granted. Filing never postpones the due date.

When the 4% ratio ends, and what a wrong claim costs

• A change in ownership or use must be reported to the assessor within six months, and a new owner must file a new application.
• If you sign the certification and are later found ineligible, or lose eligibility and do not notify the assessor within six months, the penalty is 100% of the tax paid plus interest at one-half of one percent a month, at least $30 and no more than the current year's taxes, collected like property tax.
• An owner who moves into a nursing home or community residential care facility keeps 4% while intending to return, provided the home is not rented beyond the 72-day limit.
• Under 2026 Act No. 140, for tax years after 2025, when an owner receiving 4% dies the ratio continues until the estate closes, a deed of distribution is recorded, or December 31 of the year after death, whichever is first, unless the home is rented more than 72 days or its use changes.

Recovering tax paid at 6% on a home that qualified

Section 12-43-220(c)(3) allows a refund of tax overpaid on a home that qualified, through the claim-for-refund procedure in 12-60-2560, filed with the county assessor. You must show it really was your legal residence and domicile; a county council may allow refunds of the county portion for more past years by ordinance. Charleston County uses a separate prior-year refund form.

Where a CPA fits

Most of what the assessor asks for is income tax paperwork, and it has to tell the same story as the application: the address on your returns, rental days on Schedule E, a home office on Form 8829, the state you file as a resident of. Haigler CPA Group prepares those returns and can check them against the 4% rules before you apply, particularly for relocators, part-year residents and owners who rent out part of the year.